and after entering a username and password, I clicked on "Make safe the XAMPP directory" button

The message said:

SUCCESS: The XAMPP directory is protected now! All personal data was safed in the following file:C:\Program Files\xampp\security\xamppdirpasswd.txtC:\Program Files\xampp\security\xampp.usersC:\Program Files\xampp\htdocs\xampp\.htaccess

The correct English grammar should be "All personal data was saved" (not safed)

I *LOVE* XAMPP, and I am just helping you (in a very small way) to make it even better !